Merkkijono

#include "stdio.h"
#include "stdlib.h"

int parse( char *, char **);
int putChar( char, char *, int);

int main ( int argc, char ** argv ){
	//Get String
	char * str = (char *)malloc(sizeof(char));
	int i = 0;
	str[0] = getchar();
	while (1) {
		if (str[i]== EOF){
			str[i] = '\0';
			break;
		}
		i++;
		str = (char *)realloc(str, (i+2)*sizeof(char));
		str[i] = getchar();

	}
	
	//Parse String
	while(parse(str, &str)) continue;

	//Print String
	char * p = str;
	while (*p){
		putchar(*p++);
	}
	putchar('\n');

	free(str);
	return 0;
}

int parse( char * instr, char ** pointer){
	char * p = instr;
	int i = 0;
	int j = 0;
	char * outstr = (char *)malloc(0);
	//Prevent segmentation fault by checking if first run
	int first = 1;
	while(*p) {
		j++;
		//Check if char is the same as next or previous char
		//Prevent segmentation fault by checking if first run
		if (!first){
			if (*p == *(p-1)) {
				p++;
				continue;
			}
		}
		else {
			first = 0;
		}
		if ( *p == *(p+1) ) {
			p++;
			continue;
		}
		//Push char to array
		putChar( *p++, outstr, i++);
		
	}
	putChar( *p, outstr, i);
	if (instr != outstr);
	free(instr);
	*pointer = outstr;


	if (i == j) return 0;
	return 1;
}

int putChar( char c, char * str, int length) {
	str = (char *)realloc(str, (length + 1)*sizeof(char));
	str[length] = c;
	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x000000000098f010 ***

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x000000000164e010 ***

Test 6

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000001ebd010 ***

Test 7

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000001dd3010 ***

Test 8

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000000d86010 ***

Test 9

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x0000000001067010 ***

Test 10

Verdict: RUNTIME ERROR

*** Error in `input/code': double free or corruption (!prev): 0x000000000185b010 ***